Hydrophobic concrete using waste paper sludge ash

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Title: Hydrophobic concrete using waste paper sludge ash
Authors: Wong, HS
Barakat, R
Alhilali, A
Saleh, M
Cheeseman, CR
Item Type: Journal Article
Abstract: The feasibility of using a low-cost super hydrophobic powder as water-resisting admixture or water-repellent surface coating for concrete has been investigated. The powder was produced from paper sludge ash (PSA), a by-product from the manufacture of recycled paper. The effect of hydrophobic PSA on workability, strength and transport properties, including sorptivity, water absorption, diffusivity, permeability and electrical conductivity is reported. Samples were prepared at water/cement ratio of 0.38, cured up to 28 days and conditioned at 50 °C to constant mass prior to testing. It was found that replacing Portland cement with 12% hydrophobic PSA reduced water absorption, sorptivity and conductivity by 84%, 86% and 85% respectively, with no major detrimental effects on hydration, strength and density. When used as a surface coating, the hydrophobic PSA reduced both absorption and sorptivity by 85–99% depending on the adhesive used. Samples surface coated with hydrophobic PSA showed excellent water repelling and self-cleaning characteristics.
Issue Date: 16-Jan-2015
Date of Acceptance: 6-Jan-2015
URI: http://hdl.handle.net/10044/1/56883
DOI: https://dx.doi.org/10.1016/j.cemconres.2015.01.005
ISSN: 1873-3948
Publisher: Elsevier
Start Page: 9
End Page: 20
Journal / Book Title: Cement and Concrete Research
Volume: 70
Copyright Statement: © 2015, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/
Keywords: Science & Technology
Construction & Building Technology
Materials Science, Multidisciplinary
Materials Science
Transport properties
Hydrophobic paper sludge ash
0905 Civil Engineering
1202 Building
Building & Construction
Publication Status: Published
Appears in Collections:Faculty of Engineering
Civil and Environmental Engineering

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